71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
// Copyright (c) 2013 GitHub, Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef ATOM_BROWSER_API_ATOM_API_EVENT_EMITTER_H_
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#define ATOM_BROWSER_API_ATOM_API_EVENT_EMITTER_H_
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#include <iosfwd>
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#include "base/basictypes.h"
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#include "vendor/node/src/node_object_wrap.h"
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namespace base {
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class ListValue;
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}
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namespace atom {
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namespace api {
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// Class interiting EventEmitter should assume it's a javascript object which
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// interits require('events').EventEmitter, this class provides many helper
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// methods to do event processing in C++.
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class EventEmitter : public node::ObjectWrap {
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public:
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virtual ~EventEmitter();
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// Emit an event and returns whether the handler has called preventDefault().
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bool Emit(const std::string& name);
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bool Emit(const std::string& name, base::ListValue* args);
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// Same with Unwrap but if the handle is not a native object, which happened
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// when user inherits a native class, we would search for the native object,
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// otherwise we won't get the correct C++ object.
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template <typename T>
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static inline bool SafeUnwrap(v8::Handle<v8::Object> handle, T** pointer) {
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v8::Handle<v8::Object> real_handle = SearchNativeObject(handle);
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if (real_handle->InternalFieldCount() == 0)
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return false;
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*pointer = Unwrap<T>(real_handle);
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return true;
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}
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// Helper function to call "new" when constructor is called as normal
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// function, this usually happens when inheriting native class.
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//
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// This function also does some special hacks to make sure the inheritance
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// would work, because normal inheritance would not inherit internal fields.
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static v8::Handle<v8::Value> FromConstructorTemplate(
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v8::Persistent<v8::FunctionTemplate> t,
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const v8::Arguments& args);
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// Small accessor to return handle_, this follows Google C++ Style.
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v8::Persistent<v8::Object> handle() const { return handle_; }
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protected:
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explicit EventEmitter(v8::Handle<v8::Object> wrapper);
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static v8::Handle<v8::Object> SearchNativeObject(
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v8::Handle<v8::Object> handle);
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private:
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DISALLOW_COPY_AND_ASSIGN(EventEmitter);
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};
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} // namespace api
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} // namespace atom
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#endif // ATOM_BROWSER_API_ATOM_API_EVENT_EMITTER_H_
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